Television news footage showed 5-year-old Miles Scott, aka Batkid, leaving the city's Union Square in one of two Batmobiles on Friday morning. The vehicles - two black Lamborghinis with Batman decals - were surrounded by media and onlookers.

The Lamborghinis were escorted by police, who also blocked off roads. Batkid's first caper was rescuing a damsel in distress from cable car tracks. He was also scheduled to capture the Riddler as he robs a downtown bank and receive a key to the city from Mayor Ed Lee.

A Justice Department civil rights investigation has concluded that the Ferguson Police Department and the city's municipal court engaged in a "pattern and practice" of discrimination against African Americans.